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• How to record audio with ffmpeg on linux ?

  7 décembre 2014, par Conor Patrick

  I’d like to record audio from my microphone. My OS is ubuntu. I’ve tried the following and got errors

  $ ffmpeg -f alsa -ac 2 -i hw:1,0 -itsoffset 00:00:00.5 -f video4linux2 -s 320x240 -r 25 /dev/video0 out.mpg
  
  
  
  ffmpeg version 0.8.8-4:0.8.8-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav
  
  developers
  
    built on Oct 22 2013 12:31:55 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release.
  
  Please use avconv instead.
  
  ALSA lib conf.c:3314:(snd_config_hooks_call) Cannot open shared library
  
  libasound_module_conf_pulse.so
  
  ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM hw:1,0
  
  [alsa @ 0xbda7a0] cannot open audio device hw:1,0 (No such file or directory)
  
  hw:1,0: Input/output error

  Then I tried

  $ ffmpeg -f oss -i /dev/dsp audio.mp3
  
  
  
  ffmpeg version 0.8.8-4:0.8.8-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav
  
  developers
  
  built on Oct 22 2013 12:31:55 with gcc 4.6.3
  
  *** THIS PROGRAM IS DEPRECATED ***
  
  This program is only provided for compatibility and will be removed in a future release.
  
  Please use avconv instead.
  
  [oss @ 0x1ba57a0] /dev/dsp: No such file or directory
  
  /dev/dsp: Input/output error

  I haven’t been able to get ffmpeg to find my microphone. How can I tell ffmpeg to record from my microphone ?
  It seems the ’Deprecated’ message can be ignored because of this topic

• Unrecognized option 'preset' with ubuntu 12.04 and ffmpeg

  5 novembre 2013, par hyperrjas

  I have compiled ffmpeg with the guide How To Compile FFmpeg and x264 on Ubuntu.

  Now I'm trying upload a .mp4 file to encode. However I get this error now :

  ffmpeg version git-2013-11-05-934e489 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Nov  5 2013 13:58:43 with gcc 4.6 (Ubuntu/Linaro 4.6.3-1ubuntu5)
  
    configuration: --enable-gpl --enable-libass --enable-libfaac --enable-libfdk-aac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-x11grab --enable-nonfree --enable-version3
  
    libavutil      52. 51.100 / 52. 51.100
  
    libavcodec     55. 41.100 / 55. 41.100
  
    libavformat    55. 21.100 / 55. 21.100
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.101 /  3. 90.101
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Unrecognized option 'preset'.
  
  Error splitting the argument list: Option not found
  
  
  
  Errors: no output file created.

  This is the ruby methods to encode :

  case format
  
    when 'mp4'
  
     h[:video_codec] = 'libx264'
  
     h[:audio_codec] = 'libfaac'
  
     h[:custom] = '-qscale 0 -preset slow -g 30'
  
    when 'ogv'
  
     h[:video_codec] = 'libtheora'
  
     h[:audio_codec] = 'libvorbis'
  
     h[:custom] = '-b 1500k -ab 160000 -g 30'
  
    when 'webm'
  
     h[:video_codec] = 'libvpx'
  
     h[:audio_codec] = 'libvorbis'
  
     h[:custom] = '-b 1500k -ab 160000 -f webm -g 30'
  
  end

• ffmpeg fastest way to convert videos avi to mp4 [migrated]

  5 novembre 2013, par user2938660

  I have server which has :

  • 8x3,4 (sandy bridge cpu)
  • 10gb ram

  i tried different combinations to convert vvideos i mean avi to mp4 but it takes so long :
  - 20mins= 200mb

  maybe there is some ffmpeg command which does this much faster ?

  EDIT WITH ULTRAFAST :

  root@1tb:~/test# ffmpeg -i video.avi -c:v libx264 -preset ultrafast out.mp4
  
  ffmpeg version git-2013-10-28-f1f0b01 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Oct 29 2013 02:05:45 with gcc 4.4.5 (Debian 4.4.5-8)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3 --enable-x11grab
  
    libavutil      52. 48.100 / 52. 48.100
  
    libavcodec     55. 39.100 / 55. 39.100
  
    libavformat    55. 19.104 / 55. 19.104
  
    libavdevice    55.  5.100 / 55.  5.100
  
    libavfilter     3. 90.100 /  3. 90.100
  
    libswscale      2.  5.101 /  2.  5.101
  
    libswresample   0. 17.104 /  0. 17.104
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, avi, from 'video.avi':
  
    Duration: 00:29:00.28, start: 0.000000, bitrate: 1120 kb/s
  
      Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 640x360 [SAR 1:1 DAR 16:9], 23.98 tbr, 23.98 tbn, 23.98 tbc
  
      Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, s16p, 128 kb/s
  
      Metadata:
  
        title           : Hello.Ladies.S01E06.HDTV.XviD-AFG_360p.audio
  
  [libx264 @ 0x2e08e40] using SAR=1/1
  
  [libx264 @ 0x2e08e40] using cpu capabilities: none!
  
  [libx264 @ 0x2e08e40] profile Constrained Baseline, level 3.0
  
  [libx264 @ 0x2e08e40] 264 - core 138 r2358 9e941d1 - H.264/MPEG-4 AVC codec - Copyleft 2003-2013 - http://www.videolan.org/x264.html - options: cabac=0 ref=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=12 lookahead_threads=2 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 keyint=250 keyint_min=23 scenecut=0 intra_refresh=0 rc=crf mbtree=0 crf=23.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  
  Output #0, mp4, to 'out.mp4':
  
    Metadata:
  
      encoder         : Lavf55.19.104
  
      Stream #0:0: Video: h264 (libx264) ([33][0][0][0] / 0x0021), yuv420p, 640x360 [SAR 1:1 DAR 16:9], q=-1--1, 10000k tbn, 23.98 tbc
  
      Stream #0:1: Audio: aac (libfaac) ([64][0][0][0] / 0x0040), 48000 Hz, stereo, s16, 128 kb/s
  
      Metadata:
  
        title           : Hello.Ladies.S01E06.HDTV.XviD-AFG_360p.audio
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (mpeg4 -> libx264)
  
    Stream #0:1 -> #0:1 (mp3 -> libfaac)
  
  Press [q] to stop, [?] for help
  
  frame=41726 fps=326 q=-1.0 Lsize=  312916kB time=00:29:00.32 bitrate=1473.0kbits/s dup=1 drop=0
  
  video:284876kB audio:27186kB subtitle:0 global headers:0kB muxing overhead 0.273494%
  
  [libx264 @ 0x2e08e40] frame I:167   Avg QP:18.69  size: 30492
  
  [libx264 @ 0x2e08e40] frame P:41559 Avg QP:21.68  size:  6897
  
  [libx264 @ 0x2e08e40] mb I  I16..4: 100.0%  0.0%  0.0%
  
  [libx264 @ 0x2e08e40] mb P  I16..4:  6.3%  0.0%  0.0%  P16..4: 51.2%  0.0%  0.0%  0.0%  0.0%    skip:42.5%
  
  [libx264 @ 0x2e08e40] coded y,uvDC,uvAC intra: 44.9% 54.5% 19.0% inter: 28.1% 20.3% 2.2%
  
  [libx264 @ 0x2e08e40] i16 v,h,dc,p: 43% 23% 21% 13%
  
  [libx264 @ 0x2e08e40] i8c dc,h,v,p: 36% 22% 32% 11%
  
  [libx264 @ 0x2e08e40] kb/s:1340.96
  
  root@1tb:~/test# qt-faststart out.mp4 labas1.mp4
  
  ftyp          0 32
  
  free         32 8
  
  mdat         40 319552104
  
  moov  319552144 873943
  
   patching stco atom...
  
   patching stco atom...
  
   writing ftyp atom...
  
   writing moov atom...
  
   copying rest of file...
  
  root@1tb:~/test#